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I ought to…

Il faudrait que je fasse une lessive.	I ought to do a load of washing.
Il faudrait que je décharge la voiture.	I ought to unload the car.
Il faudrait qu’on se lève avant sept heures.	We ought to be up by seven am.
Il faudrait qu’on ait le double des clefs.	We ought to have a spare set of keys.

Alternatively, you can use je dois (I must), from the verb devoir. For more information on devoir, see here.